#include"Date.h"

Date::Date(int year, int month, int day)
{
	_year = year;
	_month = month;
	_day = day;
}

bool Date::operator==(const Date& d)
{
	if (_year == d._year && _month == d._month && _day == d._day)
	{
		return true;
	}
	else
	{
		return false;
	}
}

bool Date::operator!=(const Date& d)
{
	return !(*this == d);
}


bool Date::operator>=(const Date& d)
{
	if (_year < d._year)
	{
		return false;
	}
	else if (_year == d._year && _month < d._month)
	{
		return false;
	}
	else if (_year == d._year && _month == d._month && _day < d._day)
	{
		return false;
	}
	else
	{
		return true;
	}
}

bool Date::operator<=(const Date& d)
{
	if (_year > d._year)
	{
		return false;
	}
	else if (_year == d._year && _month > d._month)
	{
		return false;
	}
	else if (_year == d._year && _month == d._month && _day > d._day)
	{
		return false;
	}
	else
	{
		return true;
	}
}

bool Date::operator>(const Date& d)
{
	return !(*this <= d);
}


bool Date::operator<(const Date& d)
{
	return !(*this >= d);
}


int Date::GetMonthDay(int year, int month)
{
	int arr[13] = { 0,31,28,31,30,31,30,31,31,30,31,30,31 };
	if (month == 2 && (((year % 4 == 0) && (year % 100 != 0)) || (year % 400 == 0)))
	{
		return 29;
	}
	return arr[month];
}

Date& Date::operator+=(const int day)
{
	_day += day;
	while (_day > GetMonthDay(_year, _month))
	{
		_day -= GetMonthDay(_year, _month);
		++_month;
		if (_month == 13)
		{
			++_year;
			_month = 1;
		}
	}
	return *this;
}


Date Date::operator+(const int day)
{
	Date tmp(*this);
	tmp += day;
	return tmp;
}

Date& Date::operator-=(const int day)
{
	_day -= day;
	while (_day <= 0)
	{
		_month--;
		if (_month == 0)
		{
			_year--;
			_month = 12;
		}
		_day += GetMonthDay(_year, _month);
	}
	return *this;
}


Date Date::operator-(const int day)
{
	Date tmp(*this);
	tmp -= day;
	return tmp;
}

Date Date::operator++()
{
	*this += 1;
	return *this;
}


Date Date::operator++(int)
{
	Date tmp(*this);
	*this += 1;
	return tmp;
}

Date Date::operator--()
{
	*this -= 1;
	return *this;
}

Date Date::operator--(int)
{
	Date tmp(*this);
	*this -= 1;
	return tmp;
}

ostream& operator<<(ostream& cout, Date& d)
{
	cout << d._year <<"-"<< d._month <<"-"<< d._day << endl;
	return cout;
}

istream& operator>>(istream& cin, Date& d)
{
	cin >> d._year;
	cin >> d._month;
	cin >> d._day;
	return cin;
}


int Date::operator-(const Date& d)
{
	Date max = *this;
	Date min = d;
	int ret = 0;
	if (max < min)
	{
		max = d;
		min = *this;
	}
	while (min < max)
	{
		min += 1;
		ret++;
	}
	return ret;
}
